This valve measures 28x9mm overall and has a 5 leads fitted on an 8-lead base *

*: The EVS datasheet for this valve shows three possible constructions - the 'wafer base' as
this example has, a tubular construction with a flat pinch with 5 leads inline, and a US type
rectangular section bulb, again with 5 leads inline.

Filament voltage

0.625V

Nominal filament current

25.0mA

Max anode voltage

45.0V

Max screen voltage

45.0V

Mutual conductance *

0.18mA/V

Anode impedance *

500kΩ

Optimal anode load

1.0MΩ

Nominal voltage gain *

35.0

*: At Va=Vg2=30, Vg1=0.

Lead

Function

1

no lead

2

Control grid

3

no lead

4

Filament -ve and suppressor grid

5

Filament +ve

6

no lead

7

Anode

8

Screen grid

The above table shows the leads for the wafer base type construction. Other construction
styles have the 5 leads arranged as filament -ve + suppressor grid, control grid, filament +ve,
screen grid, and anode, the anode lead being marked with a red dot.